1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __API_FS__ 3 #define __API_FS__ 4 5 #include <stdbool.h> 6 #include <unistd.h> 7 8 /* 9 * On most systems <limits.h> would have given us this, but not on some systems 10 * (e.g. GNU/Hurd). 11 */ 12 #ifndef PATH_MAX 13 #define PATH_MAX 4096 14 #endif 15 16 #define FS(name) \ 17 const char *name##__mountpoint(void); \ 18 const char *name##__mount(void); \ 19 bool name##__configured(void); \ 20 21 /* 22 * The xxxx__mountpoint() entry points find the first match mount point for each 23 * filesystems listed below, where xxxx is the filesystem type. 24 * 25 * The interface is as follows: 26 * 27 * - If a mount point is found on first call, it is cached and used for all 28 * subsequent calls. 29 * 30 * - If a mount point is not found, NULL is returned on first call and all 31 * subsequent calls. 32 */ 33 FS(sysfs) 34 FS(procfs) 35 FS(debugfs) 36 FS(tracefs) 37 FS(hugetlbfs) 38 FS(bpf_fs) 39 40 #undef FS 41 42 43 int cgroupfs_find_mountpoint(char *buf, size_t maxlen, const char *subsys); 44 45 int filename__read_int(const char *filename, int *value); 46 int filename__read_ull(const char *filename, unsigned long long *value); 47 int filename__read_xll(const char *filename, unsigned long long *value); 48 int filename__read_str(const char *filename, char **buf, size_t *sizep); 49 50 int filename__write_int(const char *filename, int value); 51 52 int procfs__read_str(const char *entry, char **buf, size_t *sizep); 53 54 int sysctl__read_int(const char *sysctl, int *value); 55 int sysfs__read_int(const char *entry, int *value); 56 int sysfs__read_ull(const char *entry, unsigned long long *value); 57 int sysfs__read_xll(const char *entry, unsigned long long *value); 58 int sysfs__read_str(const char *entry, char **buf, size_t *sizep); 59 int sysfs__read_bool(const char *entry, bool *value); 60 61 int sysfs__write_int(const char *entry, int value); 62 #endif /* __API_FS__ */ 63
